Which of the below statements is equivalent to $add += $add ?$add = $add$add = $add +$add$add = $add + 1$add = $add + $add + 1

To determine which of the statements is equivalent to "$add +=$add", we can break down each option and analyze them step by step:

1. $add =$add This statement is not equivalent to "$add +=$add" because it simply assigns the value of $add to itself, without performing any addition.

2. $add =$add + $add This statement is not equivalent to "$add += $add" either. It assigns the sum of$add and $add to$add, which is essentially doubling the value of $add.

3. $add =$add + 1 This statement is also not equivalent to "$add +=$add". It assigns the value of $add plus 1 to$add, which increments $add by 1.

4. $add =$add + $add + 1 This statement is equivalent to "$add += $add". It assigns the sum of$add, $add, and 1 to$add, effectively adding the value of $add to itself and then adding 1.

Therefore, the statement that is equivalent to "$add +=$add" is "$add =$add + $add + 1".